Does it really? As far as I understand it, in a traditional webhost you have a certain set of resources allocated to your account for which you pay even when 0

Does it really? As far as I understand it, in a traditional webhost you have a certain set of resources allocated to your account for which you pay even when 0 traffic hits it. Serverless consists of an isolated chuck of logic that runs only when a request hits your server. When the traffic is 0, server resources are blocked on an idle service.